Loading…

Calanus in North Norwegian fjords and in the Barents Sea

The Physical environment of a North Norwegian fjord and of the Atlantic and Arctic domains of the Barents Sea are described. The seasonal variation of primary production and biomass of the most important copepod species are described in order to contrast regional differences in the timing of the pla...

Full description

Saved in:
Bibliographic Details
Published in:Polar research 1991-12, Vol.10 (2), p.389-408
Main Author: TANDE, KURT S.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The Physical environment of a North Norwegian fjord and of the Atlantic and Arctic domains of the Barents Sea are described. The seasonal variation of primary production and biomass of the most important copepod species are described in order to contrast regional differences in the timing of the plankton cycles. Analysis of the seasonal variation in the biomass of six different copepod species in Balsfjorden clearly demonstrate the importance of Calanus finmarchkus as a spring and early summer form, whereas Pseudoculanus acuspes, the most important smaller form, reaches the highest biomass later during the productive season. In the Atlantic part of the Barents Sea, C. finmarchkus is the dominant herbivorous form. The next most important species, Pseudocalanus sp. and M. longa, play a less important role here than in Balsfjorden. In the Arctic domain, the smaller copepod forms appear to have been replaced in trophodynamic terms by the youngest year‐group (C‐CIII) of C. glacialis, which prevails during the Arctic summer and autumn periods. The coupling between primary producers and Calanus on a seasonal basis is addressed through the grazing and the vertical organisation of the plant‐herbivore community. The productivity of these two Calanus species is considered in relation to the seasonal and inter‐annual variation in climate; although different mechanisms are utilised, cold periods tend to lower Calanus productivity both in the Arctic and the Atlantic domains of the Barents Sea. Interannual variations in Calanus biomass and productivity are discussed in the perspective of endemic and advective processes.
ISSN:0800-0395
1751-8369
DOI:10.1111/j.1751-8369.1991.tb00661.x